Arch Linux

clanger

Member

Registered: 2010-01-04

Posts: 33

RAID and LVM problems after swapping motherboard

Hello, apologies if this is in the wrong forum, wasn't sure where to post...

I recently replaced an old non-UEFI motherboard on my system. This sytem had 6 HDD's attached, 2 of which were in a RAID mirror, and all using LVM.

At first I couldn't boot due to mount errors. After removing everything but / and /home from my fstab, I get the system to boot.
However things are not as they were:

All my /dev/mapper devices are there, and lvdisplay displays them correctly. However when I try and mount any LVM partition (apart from / and /home, both of which are on the same LV and PV) I get the following error:

sudo mount /dev/mapper/hdd1-pacman--cache /var/cache/pacman                                                                                                                [0]
mount: /var/cache/pacman: wrong fs type, bad option, bad superblock on /dev/mapper/hdd1-pacman--cache, missing codepage or helper program, or other error.

I get the same FS error for all my partitions. Should I just run fsck on these partitions? I'm a little wary as I don't have the disk space to back up all these partitions with dd before I do this.

I also seem to be missing my /dev/raid LVM mapper. I get the following output from mdadm --assemble --scan

ARRAY /dev/md/0  metadata=1.2 UUID=457a18fc:c7b54785:eb9946ed:fee900ca name=mushin:0

however /dev/md0 doesn't exist. I do have a /dev/md127. I used LVM ontop of my RAID device, but they are not detected at all by pvdisplay or vgdisplay.

Any suggestions for how to progress at this point would be much appreciated.

Thanks

Last edited by clanger (2017-12-14 10:28:34)

Lone_Wolf

Administrator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 14,871

Re: RAID and LVM problems after swapping motherboard

output of vgdisplay ?

does running vgscan -ay make a difference ?

What was providing the raid mirror , lvm or your previous motherboard raid support ?

Last edited by Lone_Wolf (2017-12-14 10:36:07)

---

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Try clean chroot manager by graysky

clanger

Member

Registered: 2010-01-04

Posts: 33

Re: RAID and LVM problems after swapping motherboard

VGdisplay output:

-----------
--- Volume group ---
  VG Name               backup
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1.36 TiB
  PE Size               4.00 MiB
  Total PE              357699
  Alloc PE / Size       262144 / 1.00 TiB
  Free  PE / Size       95555 / 373.26 GiB
  VG UUID               HQW5Jp-FRYo-LWTj-RVhY-tSK8-y8HQ-IpYX9V
   
  --- Volume group ---
  VG Name               hdd1
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  11
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                5
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <372.61 GiB
  PE Size               4.00 MiB
  Total PE              95388
  Alloc PE / Size       95388 / <372.61 GiB
  Free  PE / Size       0 / 0   
  VG UUID               AwlBXm-AdP6-7wZY-pjJ1-63Iw-790R-NreiKe
   
  --- Volume group ---
  VG Name               ssd
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  22
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
Act PV                1
  VG Size               <37.24 GiB
  PE Size               4.00 MiB
  Total PE              9533
  Alloc PE / Size       9533 / <37.24 GiB
  Free  PE / Size       0 / 0   
  VG UUID               XEnU5W-eB11-qQsN-AGFz-eKkc-hf0s-wXme5u

------------------

Notably this is missing my raid VG.

Running vgscan -ay just errors out (vgscan: invalid option -- 'a' Error during parsing of command line.).

RAID was done using mdadm in software. LVM was used ontop of the linux software raid.

Thanks

clanger

Member

Registered: 2010-01-04

Posts: 33

Re: RAID and LVM problems after swapping motherboard

The RAID is now working again (I had to generate the config with mdadm --examine --scan and put it in /etc/mdadm.conf.

The LVM LV's on the RAID VG seem to be mounting ok.

The only remaining problem is the unmountable partitions on the hdd1 VG. I can mount one (empty) partition on that VG, but all the others give me the error I linked in my first post.

clanger

Member

Registered: 2010-01-04

Posts: 33

Re: RAID and LVM problems after swapping motherboard

I ran fsck.ext4 on the smallest and most disposable of the unmountable LVM LV's. It had a lot of errors but now mounts correctly, and everything seems to be in order. Looks like the physical disk may be close to failure. Unsure why the RAID problem manifested itself at the same time.

Lone_Wolf

Administrator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 14,871

Re: RAID and LVM problems after swapping motherboard

try mounting them under /mnt to see if the error is because they replace existing folders.

---

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

clean chroot building not flexible enough ?
Try clean chroot manager by graysky